Astro turf type stuff

We have a small area, about 3 by 4 meters, that we'd like to cover with something along the lines of astro turf or something like that. It's where we rinse the dogs and our boards daily, and it gets muddy. We can make do with a couple of pieces if we can't get a solid piece, and are very open to other suggestions.

Any ideas as to where we can get some, or ideas on something else that would keep the mud down? Sand isn't really an option. Thanks!!!